Fixes

src/main/scala/leon/codegen/CodeGeneration.scala

src/main/scala/leon/purescala/Common.scala

src/main/scala/leon/purescala/Expressions.scala

src/main/scala/leon/purescala/MethodLifting.scala

src/main/scala/leon/purescala/TypeOps.scala

...ain/scala/leon/termination/SimpleTerminationChecker.scala

src/main/scala/leon/termination/StructuralSize.scala

src/main/scala/leon/utils/Graphs.scala